ABB ek550-40-11-110v50hz-120v60hz contactor

Why Choose the ABB EK550-40-11 Contactor?

The ABB EK550-40-11, part number SK827041-AF, is a robust 4-pole industrial contactor designed for demanding AC and DC switching applications in industrial distribution systems, heavy-duty automation and railway installations. As part of the proven ABB EK contactor series, it delivers dependable switching performance for high-current power circuits while maintaining long electrical and mechanical operating life.

Designed for industrial power switching applications, the EK550-40-11 supports operational currents up to 800 A AC-1 and motor control applications up to 315 kW at 415 V AC under AC-3 duty. Its heavy-duty construction and block-type contactor design make it suitable for harsh industrial environments requiring reliable high-capacity switching performance.

The contactor operates using a 110 V 50 Hz / 120 V 60 Hz AC control coil and includes integrated auxiliary contacts for control and monitoring circuits. Its four-pole configuration makes it particularly suitable for distribution systems, resistance heating loads and industrial isolation applications.

Key Advantages

• Heavy-duty 4-pole industrial contactor for high-current switching.
• 800 A AC-1 operational current capability.
• 315 kW motor switching capacity at 415 V AC.
• 110 V 50 Hz / 120 V 60 Hz AC control coil.
• Integrated 1 NO + 1 NC auxiliary contacts.
• Suitable for industrial distribution and railway applications.

Key Features

• ABB EK contactor series.
• 4 normally open main poles.
• 800 A AC-1 operational current.
• 550 A AC-3 operational current.
• 110 V 50 Hz / 120 V 60 Hz AC-operated coil.
• Integrated 1 NO + 1 NC auxiliary contacts.
• Heavy-duty block contactor construction.
• Suitable for AC and DC switching applications.

Technical Specifications

• Manufacturer: ABB
• Series: EK Contactors
• Model: EK550-40-11
• Part number: SK827041-AF
• Product type: Industrial power contactor
• Number of poles: 4
• Main contacts: 4 NO
• Auxiliary contacts: 1 NO + 1 NC
• Rated operational current AC-1: 800 A
• Rated operational current AC-3: 550 A
• Motor power AC-3 at 415 V: 315 kW
• Rated operational voltage: 1000 V AC
• Rated insulation voltage: 1000 V
• Control voltage: 110 V 50 Hz / 120 V 60 Hz
• Frequency: 50 / 60 Hz
• Mounting type: Panel mounting
• Application type: Distribution and railway switching
• Maximum electrical switching frequency: 300 cycles per hour AC-3
• Dimensions (H × W × D): approx. 272 × 270 × 225.5 mm
• Weight: approx. 15.5 kg

Reliable High-Current Power Switching

The ABB EK550-40-11 is engineered for industrial applications where reliable high-current switching and long-term durability are essential. Its robust contact system enables dependable switching performance for motors, distribution systems and resistive loads in demanding industrial environments.

The four-pole configuration makes the EK550 particularly suitable for complete isolation applications and balanced switching across multiple conductors. Its high operational ratings and industrial-grade construction make it ideal for continuous-duty industrial power systems.

Typical Applications

• Industrial power distribution systems.
• Railway and transportation electrical systems.
• Large industrial motor control applications.
• Resistance heating and furnace switching.
• Heavy-duty automation equipment.
• Industrial isolation and switching systems.
• High-current AC and DC power control circuits.

Trusted by Industrial Power Engineers

ABB EK contactors are trusted worldwide for reliable high-current switching performance, robust industrial construction and dependable operation in demanding power control and distribution systems.